Discontinuity stresses.(ASME section VIII Div-2)
Discontinuity stresses.(ASME section VIII Div-2)
(OP)
can anyone pls clarify below queries about discontinuity stresses:-
Pm-General membrane stress - its because of pressure loading and it is limited to S.
PL-Local membrane stress- what is this stress actually??? and why it is limited to 1.5S
Pb-primary bending stress - what is this??? also this stress not limited to any allowable value ,why??
As per Figure 5.15 of ASME section 8 div-2,
PL+Pb limited to 1.5S
and Pm+Pb not comparing with any one allowable.why??
what are the stresses generated because of local load of nozzle???
what is stress linearization and why it is required???
Pm-General membrane stress - its because of pressure loading and it is limited to S.
PL-Local membrane stress- what is this stress actually??? and why it is limited to 1.5S
Pb-primary bending stress - what is this??? also this stress not limited to any allowable value ,why??
As per Figure 5.15 of ASME section 8 div-2,
PL+Pb limited to 1.5S
and Pm+Pb not comparing with any one allowable.why??
what are the stresses generated because of local load of nozzle???
what is stress linearization and why it is required???





RE: Discontinuity stresses.(ASME section VIII Div-2)
This is an incredibly complex and complicated topic that requires some reading on your part before having a discussion here. I would recommend that you read these documents, and then come back here with specific questions.
RE: Discontinuity stresses.(ASME section VIII Div-2)
can u pls explain below query.
1. The local membrane stress(PL) is the membrane stress at very near to the discontinuity,(sqrt(T)),
Why this is limited to 1.5S... more specifically i m not understanding where this stresses will come and when??
2. Why primary bending stress(Pb) always combined with local primary membrane stress(PL)?? why not to the general membrane stress(Pm).??
Is internal pressure cause bending stress(Pb)?? or this is only from other local loads??
RE: Discontinuity stresses.(ASME section VIII Div-2)
2. Pb occurs in conjunction with Pl, and it is the summation of the two that is important. See Table 5.6 for a description/examples of the loads and locations where different classification s can be found.